first commit

client/src/layouts/DefaultLayout.tsx

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+import { Outlet } from "react-router-dom";
+import Header from "../components/Header";
+
+function DefaultLayout() {
+  return (
+    <div className="min-h-screen flex flex-col bg-[#F2F2F2]">
+      <Header />
+      <Outlet />
+    </div>
+  );
+}
+
+export default DefaultLayout;